Abstract: In order to study the compaction characteristics and particles size distribution of saturated broken rock of continuous gradation,an experimental study was conducted on saturated broken rock which satisfies the Talbol distri- bution by using self-made equipment and MTS816. 03 rock mechanics test system. The influences of n on the secant modulus,the tangent modulus,the porosity,the bulking factor and the compactness were analyzed. The variation laws of distribution coefficient r with Talbol index and axial stress were investigated. The stress-strain relationship of broken rocks was established,which can reflect the variation of particle size distribution. The results show that the secant mod- ulus,the tangent modulus,the porosity,the bulking factor and the compactness of rock samples were negatively related with the Talbol index n in the bearing process of broken rock samples. The distribution coefficient r decreased when axial stress increased. And the distribution coefficient r tended to increase with n,when the axial stress was less than 50% of the uniaxial compressive strength. When the axial stress was more than 50% of the uniaxial compressive strength,the relationship between distribution coefficient r of broken rock samples and n fluctuated. The distribution coefficient r of different n tended to be uniform with the axial stress exceeded 90% of the uniaxial compressive strength.